Micro & Nano Letters
·
2019
·Vol. 14
·期 3
·309-312
·
IF 0.975
Lihui Zhang,Suzhen Bai,Hongpeng You,Huatao Wu,Qinlong Peng,Weili Li,Kesheng Cao,Yanbiao Zhou
Submicrometre-sized EuPO 4 hollow spheres were synthesised by utilising the colloidal spheres of Eu(OH)CO 3 as the sacrificial template, for the first time. The EuPO 4 hollow spheres were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and photoluminescence, respectively. The EuPO 4 hollow spheres exhibit red colour emission from 5 D 0 – 7 F J ( J = 1, 2, 3, 4) transitions of the Eu 3+ ions. The obtained EuPO 4 hollow spheres may have potential applications in cell biology, drug release, diagnosis, due to the high chemistry stability and luminescence function.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2020
·
IF 1.88
Jing Yan,Xiaojuan Li,Bo Jin,Min Zeng,Rufang Peng
A series of TiO2, TiO2/Pd, and TiO2/PdO hollow sphere photocatalysts was successfully prepared via a combination of hydrothermal, sol-immobilization, and calcination methods. The structure and optical properties of the as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Telleranalysis, Barrett-Joyner-Halenda measurement, and UV-Vis diffuse reflectance spectroscopy. The photocatalysis efficiencies of all samples were evaluated through the photocatalytic degradation of rhodamine B under visible light irradiation. Results indicated that TiO2/PdO demonstrated a higher photocatalytic activity (the photocatalytic degradation efficiency could reach up to 100% within 40 min) than the other samples and could maintain a stable photocatalytic degradation efficiency for at least four cycles. Finally, after using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species for the effectiveness of the TiO2/PdO photocatalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tianyan Lan,Hongmei Du,Yunwu Li,Konggang Qu,Jinsheng Zhao,Xianxi Zhang,Yunyun Dong,Yan Zhang,Xueyue Zhang,Danyang Zhang
The development of bifunctional electrocatalysts to reduce the polarization loss is essential to enhance the performance of Zn-air batteries. The combination of metal-organic frameworks (MOFs) with metal or metallic compounds provides a way to integrate their merits and effectively improve their electrocatalytic performances. However, previous synthesis of MOFs/metal oxides usually involves high-temperature calcination , which makes it difficult to control their morphologies. In this work, through a ligand-insufficient and high temperature controlled solvothermal reaction, innovative NiFe-MOF/NiFe 2 O 4 hollow nanospheres were one-pot prepared without using any shape-controlled agent or calcination process. The as-obtained NiFe-MOF/NiFe 2 O 4 shows better ORR and OER performance than pure NiFe-MOF and NiFe 2 O 4 , suggesting a synergetic effect between NiFe-MOF and NiFe 2 O 4 . The maximum power density of the liquid Zn-air battery assembled using NiFe-MOF/NiFe 2 O 4 as the air electrode catalyst is 158.4 mW cm −2 at 246.1 mA cm −2 . This work offers fresh thoughts into designing highly efficient MOF-derived electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 24
·8013
·
IF 4.6
Yuzhou Xia,Xinghe Xia,Shuying Zhu,Ruowen Liang,Guiyang Yan,Feng Chen,Xuxu Wang
Visible-light-driven N2reduction into NH3in pure H2O provides an energy-saving alternative to the Haber–Bosch process for ammonia synthesizing. However, the thermodynamic stability of N≡N and low water solubility of N2remain the key bottlenecks. Here, we propose a solution by developing a WO3−xhollow sphere with oxygen vacancies. Experimental analysis reveals that the hollow sphere structure greatly promotes the enrichment of N2molecules in the inner cavity and facilitates the chemisorption of N2onto WO3−x-HS. The outer layer’s thin shell facilitates the photogenerated charge transfer and the full exposure of O vacancies as active sites. O vacancies exposed on the surface accelerate the activation of N≡N triple bonds. As such, the optimized catalyst shows a NH3generation rate of 140.08 μmol g−1h−1, which is 7.94 times higher than the counterpart WO3-bulk.Keywords:WO3;hollow sphere;O defect;N2reduction;photocatalysis
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2010
·
IF 3.898
Jinqiang Jiang,Qiaozhen Shu,Xin Chen,Yiqun Yang,Chenglin Yi,Xiaoqing Song,Xiaoya Liu,Mingqing Chen
A novel photosensitive C-PNIPAAm comprising hydrophilic PNIPAAm conjugated with a relatively short but very hydrophobic coumarin part was designed and prepared using a coumarin-containing disulfide derivative (C-S-S-C) as transfer agent in the presence of Bu3P and water. It was found that C-PNIPAAm can form polymer micelles in aqueous solution. And the micellar morphology in aqueous solution can be photoswitched into hollow spheres according to the photodimerization of coumarin end groups upon 365 nm irradiation and reform the micellar morphology after the subsequent photoscission of dimers upon 254 nm. This instant morphology changing phenomenon was successfully monitored by dynamic light scattering (DLS) and transmission electron microscopy (TEM) measurements. TEM observations showed the small spherical shape of micelles with diameter at 30−50 nm before photo-cross-linking, the big vesicles with diameter at 200−350 nm after photo-cross-linking, and the small micelles with diameter at 30−50 nm after the subsequent photo-de-cross-linking in the first irradiation cycle. The reason for this significant morphology switching can be attributed to the reversible photoinduced amphiphilic structure transformation between the telechelic “hydrophobic end−hydrophilic chain” structure and the ABA type of “hydrophilic chain−hydrophobic center−hydrophilic chain” one upon alternating irradiation.
研究领域:
高分子化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jianhua Zheng,Lei Zhang
3-D hollow sphere-like Ni 3 V 2 O 8 immobilizing V 2 O 5 nanoparticles were successfully synthesized via in situ recrystallization method without any template. The compact contact between V 2 O 5 and Ni 3 V 2 O 8 ensuring the photo-inducted carriers fast transport, which would be beneficial for inhibiting recombination rate of electron-hole ( e - /h + ) pairs. Moreover, the hollow sphere-like structure composed of the smaller nanoparticle could effectively improve of visible light capture capacity (multiple scattering for hollow architectures). Benefiting the synergistic promoting effect of the suitable heterojunction and the fascinating 3D hollow feature, the V 2 O 5 @Ni 3 V 2 O 8 indicated significantly degradation performance when evaluated as photocatalyst for degradation antibiotics and chlorophenols under visible light irradiation. Impressively, the 2-V 2 O 5 @Ni 3 V 2 O 8 heterojunction deliver the optimal degradation efficiency for TC (OTC) and 2,4-DCP (4-CP) were 90.0% (~ 91.2%) and 92.6% (~ 90.0%), respectively. The appearance mechanism for the enhancement photocatalytic performance was also elucidated in detail. The facile strategy provides a novel insight into the designing of the photocatalyst with advantages of charges separation and light-harvesting for degradation of contaminants in wastewater.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yuan Ding,Zhi Lin,Jiawei Deng,Yingliang Liu,Li Zhang,Kunlun Wang,Shengang Xu,Shaokui Cao
In this work, a series of carbon dots (CDs) modified hollow g-C 3 N 4 spheres (HCNS-C x ) were constructed via a double in situ approach using cyanamide and glucose as precursors, respectively. As HCNS-C x was synthesized by one-step in situ thermal polymerization of two precursors, which could make CDs and g-C 3 N 4 keep tight connection and increase the separation of the photogenerated electron-hole pairs. The average diameter and wall thickness of the HCNS-C x are about 355 nm and 55 nm, respectively. Under the visible light irradiation , the H 2 evolution rate (HER) of HCNS-C 1.0 (2322 μmol g −1 h −1 ) was 19 times that of bulk g-C 3 N 4 (122 μmol g −1 h −1 ) and 1.8 times that of HCNS without CDs modification (1289 μmol g −1 h −1 ), respectively. And its apparent quantum efficiency is 17.93% at 420 nm. The specific surface area, light absorption capacity , and charge carrier mobility of HCNS-C x could be dramatically improved due to the introduction of CDs and hollow structures of g-C 3 N 4 spheres, resulting in a significant improvement of photocatalytic activity .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 10
·4769-4777
·
IF 2.961
Chang Xueyi,Qiu Yongfu,Cheng Zhiyu,Wang Xiaoting,Zhong Qingpeng,Huang Huizhen
To improve the specific capacitance of supercapacitor with bismuth oxide, this paper reports hollow nanosheet-assembled α-Bi 2 O 3 spheres prepared by solvothermal method as novel electrode materials. The electrochemical results show that the hollow nanosheet-assembled α-Bi 2 O 3 spheres exhibited a high electrochemical performance with a maximum specific capacitance of 1380.2 F g −1 at a current density of 1 A g −1 , which is the highest specific capacitance achieved to date with bismuth oxide as electrode material, and remarkable rate capability of 84.1% when the current density increased to as high as 15 A g −1 . The reasons for the high capacitance performance of the product are due to the monoclinic α-Bi 2 O 3 with a stable phase and more ion channels to transport and store ions, as well as the hollow spherical structure with porosity, which makes the material fully utilized. In a word, Bi 2 O 3 should be as a promising candidate towards high-performance electrode for pseudocapacitive supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 49
·12932-12937
·
IF 5.16
Guozhen Zhu,Qing Li,Renchao Che
Graphical On the ball : The high charge/discharge voltage (1.65 V), long life span, and excellent reversibility of TiNb 2 O 7 have led to its use as an anode for lithium ion batteries. In order to overcome its inherent poor electronic conductivity, it is herein formed as hollow spheres, and coated with carbon, resulting in a much-improved anode performance. TiNb 2 O 7 , with high charge/discharge voltage (1.65 V), long life span, and excellent reversibility has become a new anode material for lithium ion batteries in recent years. However, the inherent poor electronic conductivity strictly limits its practical applications. Herein, we report for the first time hollow TiNb 2 O 7 @C spheres, with carbon spheres as sacrificial template. The special hollow structure can effectively relieve the volume expansion during the repeated process of charging/discharging. The conductivity of hollow TiNb 2 O 7 spheres can be greatly improved by the carbon layers uniformly coated outside the surface of TiNb 2 O 7 spheres. Besides, the particle aggregation can be conspicuously suppressed by the uniformly coated carbon layers. As a result, hollow TiNb 2 O 7 @C spheres show a prominent charge/discharge capacity of 282.6/283.8 mAh g −1 after 100 cycles at 0.25 C (1 C=388 mA g −1 ), revealing the excellent cycle performance and high reversible capacity. Meanwhile, the charge/discharge capacity of 157.5 and 157.9 mAh g −1 can be maintained at 10 C after 10 cycles. The facial synthetic method can be extended to prepare various materials with volume expansion during repeated charging/discharging process.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Soft Matter
·
2011
·Vol. 7
·期 16
·7526-7531
·
IF 4.457
Shengtong Sun,Peiyi Wu
Highly branched poly(N-isopropylacrylamide) (PNIPAM) was first synthesized by self-condensing atom transfer radical copolymerization (SCATRCP) catalyzed by CuBr/tris[2-(dimethylamino)ethyl]amine (Me6TREN) complex in isopropanol at room temperature. This method showed good control over chain morphology and lower critical solution temperature (LCST) type phase transition behavior of PNIPAM by varying reaction time and monomer/inimer feed ratios. On the basis of GPC, FTIR, 1HNMR and DSC results, four stages were discerned during the polymerization procedure, at which chain architectures experienced “linear – comblike – slightly branched – highly branched” transformations. Additionally, the synthesized highly branched PNIPAM chains were found to be able to self-assemble into hollow spheres in alcohols such as methanol and ethanol, which arise from the presence of large amounts of hydrophobic branched points inside polymer chains.
研究领域:
高分子化学
·
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Hao Gao,Chun-Ling Liu,Yang Liu,Zong-Huai Liu,Wen-Sheng Dong
In this study, novel MoO 2 -loaded porous carbon hollow sphere composite materials were synthesized. The composites consisted of homogeneous hollow microspheres with a size of ∼0.7 ± 0.1 μm and a shell thickness of ∼70 nm; MoO 2 nanoparticles with an average size of ∼12 nm were uniformly dispersed in the shells of the porous carbon hollow spheres (PCHS). The MoO 2 /PCHS composites showed high capacity and excellent capacity retention when they were applied as an anode material for Li ion batteries . The composite containing 44.2% of MoO 2 revealed a reversible capacity of 574 mAh g −1 at a current density of 50 mA g −1 , and a first coulombic efficiency of 61%. After 80 cycles, this composite still retained a capacity of 640 mAh g −1 . The good electrochemical performance could be due to the fact that the MoO 2 nanoparticles were homogeneously embedded in the shells of the porous carbon hollow spheres in the composites, which effectively prevented volume change or aggregation of the MoO 2 nanoparticles during the lithium ion insertion/extraction process. The porous carbon hollow spheres with good electronic conductivity and high surface area offered a large electrode/electrolyte contact area, and a short path length for the Li + transport.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 19
·8693-8700
·
IF 3.591
Xianfeng Zhang,Zongqun Li,Shaowen Xu,Yaowen Ruan
Carbon nanosphere templates were prepared hydrothermally using glucose as a carbon source. A coated composite was formed by encapsulating the nanospheres with n-butyl titanate and calcinating the composite according to a controlled temperature programme to remove the carbon nanosphere templates; hollow-structured TiO2 nanospheres were obtained. Then, a TiO2/CQD nanocomposite was prepared with carbon quantum dots (CQDs) by covalent bonding. The structure and morphology of the carbon sphere templates, CQDs, TiO2 nanospheres and composite were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and other characterization techniques. The photocatalytic degradation of a methyl orange (MO) solution by the TiO2/CQD composite nanomaterial was studied. The results showed that the nanocomposites were hollow TiO2 spheres with a diameter of approximately 1.1 μm, a thickness of approximately 50 nm and a specific surface area of approximately 27.9 m2 g−1. The composite exhibited the highest visible light photocatalytic activity when the CQD content was 4.0%. The corresponding apparent first-order rate constant was 0.00429 min−1, which is 2.6 times greater than that of hollow TiO2.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）